Macintosh Portable

Stephen Pereira spereira1952 at
Sun Nov 27 12:49:55 CST 2016

I am not certain exactly what you mean by polarity in this case, but I’m guessing that you are asking which contact is positive and which is negative.
If that’s the case, the center socket is positive, and the outer jacket band is negative.

I hope this helps.

Stephen M. Pereira
Bedford, NH  03110

> On Nov 27, 2016, at 1:00 PM, cctech-request at wrote:
> ------------------------------
> Message: 6
> Date: Sat, 26 Nov 2016 16:26:43 +1000
> From: Chris Pye <pye at <mailto:pye at>>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> 	<cctalk at <mailto:cctalk at>>
> Subject: Macintosh Portable
> Message-ID: <00D543B1-7E32-40DE-8829-91E3EBFCBF4A at <mailto:00D543B1-7E32-40DE-8829-91E3EBFCBF4A at>>
> Content-Type: text/plain; charset=utf-8
> Does anyone know off hand what polarity that Mac Portable requires? I know that the original was 7.5V @ 1.5A, but not sure of the polarity.
> I did have have a PB100 power supply that I used with mine, but (unfortunately) no longer have it.
> Also (if it still works) what is the easiest way to image the old Conner SCSI drive? It doesn?t appear to have a standard connector.
> I have googled this, but didn?t come up with anything useful.
> Thanks,
> Chris...

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